After enjoying a big success, "The Muppets" is now set to have a follow-up. Vulture broke the news that a sequel to the puppet comedy movie is already in the works, but it seems that Jason Segel will not return as the screenwriter.

While director James Bobin and co-writer Nicholas Stoller have all been signed up for the sequel project, Segel reportedly didn't sign the deal due to his tight schedule. Multiple insiders explained that the comedian is currently busy working on his other TV and movie projects.

Segel's representative hasn't offer any official statement regarding the report. However, sources close to "The Muppets Sequel" project revealed that Walt Disney Pictures still has a chance to bring back Segel in the cast ensemble, depending on the result of Stoller's script.

"The Muppets" was released in the U.S. theaters on November 23, 2011. As of January this year, the movie grossed $87.1 million in North America and $102.1 million worldwide, making it the highest-grossing "Muppets" film ever.

As for Segel, the 32-year-old funnyman is now committed to write a sitcom on CBS. He is also busy with promotional work for Judd Apatow's comedy films, "The Five-Year Engagement" which will be released in the U.S. in April and "This Is Forty" which will open nationwide in December.